PROBLEM SOLVED!
CREATE FOLDER ANY NAME
COPY SEVICE PACK CONTENTS TO HARD DISK.
REPLACE ANY EXISTING FILES, OK TO ALL.
WHEN COMPLETED GO INTO INTEL DIR,
FIND AND RUN "START.SPK" AWAY YO GO!
When loading Catia r18 service pack 3 it always stops instalation at 39% on requesst of 2nd disc, I have tried new disc,s to no avail de installed rebooted prayed! can anyone help, I have installed latest patches kB926255 ?